Caliper



March 22 1927. 1,621,526

J. CULELL CALIPER Filed Sept. 14, 1923 2 Sheets-Sheetl min . INVENTOR.

33H (Luau ATTORNEYZ/ March 22 1927. 1,621,526

J. CULELLY CALIF-ER 1 Filed Sefat. 14, 1925 2 Sheets-Sheet? INVENTOR.

Joana. lelL Patented Mar. 22 1927.

UNITED STATES PATENT "oF -icE,

JOHN oULELL, or DETRO T," MICHIIIGAIN.

CALIPER.

Application filed September 14,1923. 'Serial No. 662,619.

' is operated by a rack and pinion mounted on a shank provided with a cooperating rack. Another object of the invention is the provision of a caliper having a scale on a slide and an additional scale operated upon the opening or closing of said calipers to lndicate fractions of measurements on said slide scale.

Other objects will appear hereinafter.

The invention consists in the combinations andarrangements of partshereinafter described and claimed.

The invention will be best understood from a reference to the accompanying drawings which form a part of this specification and in which, I i

Fig. 1 is a top plan view of the invention,

Fig. 2 is aside elevational vieW of the invention,

Fig. 3 is a top plan View of the invention partly open and with parts removed, Fig. 4 is a sectional view taken on substantially line 44 of Fig. 1,

Fig. 5 is a sectional view taken. 5-5 of Fig. 1, i

Fig. 6 is a bottom plan View of the-invention, and

' Fig. 7 is a sectional view taken on substantially line 77 of Fig. 6.

The invention in its preferred form comprises a'housing 12 projecting from which, and integral therewith, is a stem 13. Projecting from one side of the housing is an arm 14 which is adapted for measuring the external diameter of work pieces and the like. Projecting from the opposite side of the housing is an arm 15 Which is adapted for measuring internal bores and the like. An arm 15 is provided for co-operating on line with the arm 15 and an arm 14' is provided for co-operating with the arm 14. Extending from these arms 14 and 15 is a bar 16 which is provided on one surface with a graduated scale. A bar 17, which is spaced from the bar 16 by the space 13 extends from the arms also and is connected at the free end with the bar 16 by means of a crosspiece, aportion 19 of which projects beyond the outer edge of the member 17. Mounted on the housing 12 is'a fingerhold 20, having a stop 21 formed thereon, the same being formed arcuate to facilitate the movement of the member 12 and the member 13 relatively to the members 16 and 17. I

Formed in the base of the housing 12 are recesses 22 and 22. The member 16 is adapted for slidable movement in the recess" 22 and the member 17 is adapted for slidable movement in the recess 22', said recesses being separated by a continuation of the member 13. Formed in .the houslng'is a recess 23 in alignment with a recess 24* formed in the member 13. A leaf spring which is normally arcuate is adapted. for insertion into the recesses 23 and 24, this leaf spring 25 beingadapted to resist the slidable movement of the member 17 rela-- i tively to the housing 12 because of its being flexed into a straight condition. from its normally arcuate form. Formed in the opposite side of the member 13 is a recess 24 in alignment with which is a recess23' formed in the housing 12. A similar lead spring .25 is adapted to engage'in these recesses 24 and 23 for the purpose of resisting the slidable movement of the members 16 relatively to the housing 12. These Springs do not prevent the slidable movementof the housing 12 relatively to the members 16 and 17 but serve to resist this slidable move-' ment merely through friction.

Mounted on'a shaft 26 journalled in a recess formed in the base of the housing 12- is a gear Wheel 27 adapted for meshing,

with the rack bar 17. Geared on the upper surface-of the wheel 27 is a' larger gear 28 fixedly attached thereto and adapted to r0- tate therewith. The gear 28 is adapted to meshwith a smaller gear 29 which is mounted on a shaft 30 journalled in a recess formed in the housing 12. Fixedly attached to and adapted to rotate with the gear 29 is an enlarged gear 31 which meshes With a gear 32, carrying a shaft 33 which is fixedly attached thereto centrally thereof. F ixedly mounted on the shaft 33 is a pointer 34 adapted to co-operate with a dial 35 which is provided with a scale so divided as to indicate the degrees or distances of separation of the members 14 and 14' and the members 15 and 15' as the housing 12 is moved relatively to the rack bar 17 and the memben 16.- Threaded into the upper portion ofthe-.housing*12 is a ring 36 having a flange 37 adapted to engage the upper surface of the housing 12. Member, 36is also 5 provided with an inwardly'projectingfiange 39 adapted to rest upon the upper surface-ofa glass disc which is positioned over the indicating dial and the indicating pointer 34, a suitable shoulder 40 being provided 10; for supporting the glass.-

Formed on the memberltiis a graduated scalesco-operating with WlllCll is an indicating. member 411 provided with a line or mankeriiormed thereon.- Upon Withdrawing the members 14. and 1 away from each other the, marker 41' indicates on the scale formed on, the member 16 the distance of separation: ofi these'members 1 1 and 141 In assembling'the device the member 13 .201isinseritedin-the:space 13 Which separates the members 16 and 17, between bifurcations ;of the member'19 wliich lie on opposite sides of: the' members 16 and 17 as shown in Fig..7. Thesprings and 25 are then 25* inserted in position in their respective grooves; already described;

In'using, the device, the members 14 and 14J,.or 15and 15, are placed in operative position; relatively to the Work piece to be measured-1 and the housingclfz'is then moved relatively"to=themembers 16 and 17 The marker; 4-11 Will: then indicate on the scale formedzon-the member. 1'6,-the distance measured "while: the indicating: pointer 34: Will 35 show minor divisions of the distance. By-

mountingthe'pointer 34in the manner indi cated,- it is clear that: through the gearing used the indicator may be used' for measuring: very small dimensions up to one hun- 40- dredzthousandths of am inch. Intusing the members 15and-15"'internal diameters may be measured and! in using the members 14E lineal dimensions may be measured for external diameters.

VVhil'erIx have illustratedand described the preferredi forms of" construction, I do not WlSll? to limit myself to the precisedetails oftstructure shown. in the drawings but desires to avail myself of such 1 variations and modifications ascomehwithinthe scope of the appended: claims.

- Having. thus described my invention that I-Olillllni-EtSzHQXV'aIICl de's'ireto se'cjure bylietters Patent is 1-. A measuring device of the class described comprising an elongated ban having teeth formed on one longitudinal edge there of, said elongated bar being provided with a slot extending longitudinally thereof; a pair of engaging fingers each projecting from the opposite longitudinal edges of said bar adjacent one end thereof; a bar slidably mounted in said slot; a pair of fingers projecting: tromzthe opposite longitudinal edges 01 said slidably mounted bar; the fingers on the respectivesidesof said'bars being adapted for cooperating for engaging; material to'be measured; a housing carried by the saidslidably mounted bar, said-housing having a plurality of recesses formed therein ga plurality of gears mounted in'said recesses in operative relation oneof said gears being adapted for engaging: the teeth-on the edge: of; thei said pair; a dial carried by- SaiddiouS- ing; a pointer connected to=oneof said gears 7 I and adapted: upon the movement of said slidably mountcd bar relatively toatheother liar for indicating on said: di all the distance of movements. V

2. In a measuring device of the classdeg scribed a pair of bars laterally spaced from each: other and in'thesame planeyrack: teeth formed on one longitudinal edge ot-one of said'bars; a pair of engagingmembers one engaging member projecting'fromtheouter longitudinal edge on each of said? bars adjacent one end thereot'; a housingyprovided with a pair oil recesses, slidably mounted-on? said bars; engaging members projecting trom opposite sidesot'saidihousing and'be 9O ingiin alignment Withthe respective-"engaging 'member projecting from said; bars; a stem projecting from said. housing and adapted for slidablennovc'me'nt between said bars; resilient means for'resis-ting said slidable movement; a1 scale bearingdialmounted on said housingga plurality of gears mounted in said recesses in cooperative relation, one: of said gears being: in engagement with said rack teeth and a pointer operated by said gears upon movement of said housing relatively to said spaced bars for indicating OIlI saidscalebear ing dialthe distance of movements. In testimony Whereo'fT have signed the foregoing specification.

JOHN Gunner-i. 

